Smelly Lunch Bags/Boxes

How can I deodorize smelly lunch bags and lunch boxes?

To clean: Place a paper towel dampened with white household vinegar inside. (Alternatively, sprinkle odor-neutralizing baking soda into the bag/box, or stuff with crumpled newspaper to absorb moisture.) Leave overnight. In the morning, discard towel, then wash the bag or box and dry well. When it's not in use, leave the lid open to air out.

Kid hint: Remind your kids to dispose of food scraps and wrappers as soon as they've eaten, then use a napkin to wipe off the inside surface.